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    Subject[PATCH v7 02/12] file: Export receive_fd() to modules
    Date
    Export receive_fd() so that some modules can use
    it to pass file descriptor between processes without
    missing any security stuffs.

    Signed-off-by: Xie Yongji <xieyongji@bytedance.com>
    ---
    fs/file.c | 6 ++++++
    include/linux/file.h | 7 +++----
    2 files changed, 9 insertions(+), 4 deletions(-)

    diff --git a/fs/file.c b/fs/file.c
    index f633348029a5..ef4da2eaf25b 100644
    --- a/fs/file.c
    +++ b/fs/file.c
    @@ -1135,6 +1135,12 @@ int __receive_fd(int fd, struct file *file, int __user *ufd, unsigned int o_flag
    return new_fd;
    }

    +int receive_fd(struct file *file, unsigned int o_flags)
    +{
    + return __receive_fd(-1, file, NULL, o_flags);
    +}
    +EXPORT_SYMBOL_GPL(receive_fd);
    +
    static int ksys_dup3(unsigned int oldfd, unsigned int newfd, int flags)
    {
    int err = -EBADF;
    diff --git a/include/linux/file.h b/include/linux/file.h
    index 225982792fa2..4667f9567d3e 100644
    --- a/include/linux/file.h
    +++ b/include/linux/file.h
    @@ -94,6 +94,9 @@ extern void fd_install(unsigned int fd, struct file *file);

    extern int __receive_fd(int fd, struct file *file, int __user *ufd,
    unsigned int o_flags);
    +
    +extern int receive_fd(struct file *file, unsigned int o_flags);
    +
    static inline int receive_fd_user(struct file *file, int __user *ufd,
    unsigned int o_flags)
    {
    @@ -101,10 +104,6 @@ static inline int receive_fd_user(struct file *file, int __user *ufd,
    return -EFAULT;
    return __receive_fd(-1, file, ufd, o_flags);
    }
    -static inline int receive_fd(struct file *file, unsigned int o_flags)
    -{
    - return __receive_fd(-1, file, NULL, o_flags);
    -}
    static inline int receive_fd_replace(int fd, struct file *file, unsigned int o_flags)
    {
    return __receive_fd(fd, file, NULL, o_flags);
    --
    2.11.0
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